"I disagree; I think it IS their business. Healthier employees cost less to insure, and health insurance is a large cost of employing people."
Health information is private for very good reasons. Employers who don't understand medicine have no business gaining access to our medical records, making decisions, and potentially discriminating based on their ignorant assumptions about employee health statues and problems.
"If the American people don't like this, then they need to vote for health insurance to be totally separate from employment. But Americans won't do that, because that's "socialism". So we're getting exactly what we've voted for."
This "we" business is a very lazy argument. There are large numbers of people who have been against this system. "WE" are not getting what "we" voted for, without even considering that we haven't really had the opportunity to vote for it in the first place.
"If employers are expected to subsidize your health insurance costs, they have every right to your health information."
This subsidization is a pooled, monetary component of employee compensation. While population-based behaviors will impact the overall insurance cost, individaul behaviors aren't likely to. But since you're so bent on giving employers actionable information about worker lifestyle choices, perhaps you should focus on easy choices that impact ability to work like prescription drug use like Ambien, guys who stay up late to watch sports, or anyone who stays up late to watch late shows, drinking too much, eating too much, eating an unhealthy diet (which depends on who you ask of course) . . .
By the way: given that employer-mediated health insurance is part of the compensation package, if this mediation was no longer connected with employment, do you just assume that the employer keeps the money that was previously part of an employee's earnings? Or do employees get the compensation that was bargained for? Or is it sent to the government for the provision of universal healthcare? Either way, the employer is paying a wage for services rendered.